SUNRPC: Provide functions for managing universal addresses

Introduce a set of functions in the kernel's RPC implementation for
converting between a socket address and either a standard
presentation address string or an RPC universal address.

The universal address functions will be used to encode and decode
RPCB_FOO and NFSv4 SETCLIENTID arguments.  The other functions are
part of a previous promise to deliver shared functions that can be
used by upper-layer protocols to display and manipulate IP
addresses.

The kernel's current address printf formatters were designed
specifically for kernel to user-space APIs that require a particular
string format for socket addresses, thus are somewhat limited for the
purposes of sunrpc.ko.  The formatter for IPv6 addresses, %pI6, does
not support short-handing or scope IDs.  Also, these printf formatters
are unique per address family, so a separate formatter string is
required for printing AF_INET and AF_INET6 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 365 insertions, 1 deletions

diff --git a/net/sunrpc/Makefile b/net/sunrpc/Makefile
index db73fd2a3f0e..9d2fca5ad14a 100644
--- a/net/sunrpc/Makefile
+++ b/net/sunrpc/Makefile
@@ -10,7 +10,7 @@ obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma/
 sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \
             auth.o auth_null.o auth_unix.o auth_generic.o \
             svc.o svcsock.o svcauth.o svcauth_unix.o \
-            rpcb_clnt.o timer.o xdr.o \
+            addr.o rpcb_clnt.o timer.o xdr.o \
             sunrpc_syms.o cache.o rpc_pipe.o \
             svc_xprt.o
 sunrpc-$(CONFIG_NFS_V4_1) += backchannel_rqst.o bc_svc.o
diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
new file mode 100644
index 000000000000..22e8fd89477f
--- /dev/null
+++ b/net/sunrpc/addr.c
@@ -0,0 +1,364 @@
+/*
+ * Copyright 2009, Oracle.  All rights reserved.
+ *
+ * Convert socket addresses to presentation addresses and universal
+ * addresses, and vice versa.
+ *
+ * Universal addresses are introduced by RFC 1833 and further refined by
+ * recent RFCs describing NFSv4.  The universal address format is part
+ * of the external (network) interface provided by rpcbind version 3
+ * and 4, and by NFSv4.  Such an address is a string containing a
+ * presentation format IP address followed by a port number in
+ * "hibyte.lobyte" format.
+ *
+ * IPv6 addresses can also include a scope ID, typically denoted by
+ * a '%' followed by a device name or a non-negative integer.  Refer to
+ * RFC 4291, Section 2.2 for details on IPv6 presentation formats.
+ */
+
+#include <net/ipv6.h>
+#include <linux/sunrpc/clnt.h>
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+
+static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
+                                  char *buf, const int buflen)
+{
+        const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+        const struct in6_addr *addr = &sin6->sin6_addr;
+
+        /*
+         * RFC 4291, Section 2.2.2
+         *
+         * Shorthanded ANY address
+         */
+        if (ipv6_addr_any(addr))
+                return snprintf(buf, buflen, "::");
+
+        /*
+         * RFC 4291, Section 2.2.2
+         *
+         * Shorthanded loopback address
+         */
+        if (ipv6_addr_loopback(addr))
+                return snprintf(buf, buflen, "::1");
+
+        /*
+         * RFC 4291, Section 2.2.3
+         *
+         * Special presentation address format for mapped v4
+         * addresses.
+         */
+        if (ipv6_addr_v4mapped(addr))
+                return snprintf(buf, buflen, "::ffff:%pI4",
+                                        &addr->s6_addr32[3]);
+
+        /*
+         * RFC 4291, Section 2.2.1
+         *
+         * To keep the result as short as possible, especially
+         * since we don't shorthand, we don't want leading zeros
+         * in each halfword, so avoid %pI6.
+         */
+        return snprintf(buf, buflen, "%x:%x:%x:%x:%x:%x:%x:%x",
+                ntohs(addr->s6_addr16[0]), ntohs(addr->s6_addr16[1]),
+                ntohs(addr->s6_addr16[2]), ntohs(addr->s6_addr16[3]),
+                ntohs(addr->s6_addr16[4]), ntohs(addr->s6_addr16[5]),
+                ntohs(addr->s6_addr16[6]), ntohs(addr->s6_addr16[7]));
+}
+
+static size_t rpc_ntop6(const struct sockaddr *sap,
+                        char *buf, const size_t buflen)
+{
+        const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+        char scopebuf[IPV6_SCOPE_ID_LEN];
+        size_t len;
+        int rc;
+
+        len = rpc_ntop6_noscopeid(sap, buf, buflen);
+        if (unlikely(len == 0))
+                return len;
+
+        if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
+            !(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_SITELOCAL))
+                return len;
+
+        rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
+                        IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
+        if (unlikely((size_t)rc > sizeof(scopebuf)))
+                return 0;
+
+        len += rc;
+        if (unlikely(len > buflen))
+                return 0;
+
+        strcat(buf, scopebuf);
+        return len;
+}
+
+#else   /* !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) */
+
+static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
+                                  char *buf, const int buflen)
+{
+        return 0;
+}
+
+static size_t rpc_ntop6(const struct sockaddr *sap,
+                        char *buf, const size_t buflen)
+{
+        return 0;
+}
+
+#endif  /* !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) */
+
+static int rpc_ntop4(const struct sockaddr *sap,
+                     char *buf, const size_t buflen)
+{
+        const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+
+        return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
+}
+
+/**
+ * rpc_ntop - construct a presentation address in @buf
+ * @sap: socket address
+ * @buf: construction area
+ * @buflen: size of @buf, in bytes
+ *
+ * Plants a %NUL-terminated string in @buf and returns the length
+ * of the string, excluding the %NUL.  Otherwise zero is returned.
+ */
+size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+        switch (sap->sa_family) {
+        case AF_INET:
+                return rpc_ntop4(sap, buf, buflen);
+        case AF_INET6:
+                return rpc_ntop6(sap, buf, buflen);
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_ntop);
+
+static size_t rpc_pton4(const char *buf, const size_t buflen,
+                        struct sockaddr *sap, const size_t salen)
+{
+        struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+        u8 *addr = (u8 *)&sin->sin_addr.s_addr;
+
+        if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
+                return 0;
+
+        memset(sap, 0, sizeof(struct sockaddr_in));
+
+        if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
+                return 0;
+
+        sin->sin_family = AF_INET;
+        return sizeof(struct sockaddr_in);;
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static int rpc_parse_scope_id(const char *buf, const size_t buflen,
+                              const char *delim, struct sockaddr_in6 *sin6)
+{
+        char *p;
+        size_t len;
+
+        if ((buf + buflen) == delim)
+                return 1;
+
+        if (*delim != IPV6_SCOPE_DELIMITER)
+                return 0;
+
+        if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
+            !(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_SITELOCAL))
+                return 0;
+
+        len = (buf + buflen) - delim - 1;
+        p = kstrndup(delim + 1, len, GFP_KERNEL);
+        if (p) {
+                unsigned long scope_id = 0;
+                struct net_device *dev;
+
+                dev = dev_get_by_name(&init_net, p);
+                if (dev != NULL) {
+                        scope_id = dev->ifindex;
+                        dev_put(dev);
+                } else {
+                        if (strict_strtoul(p, 10, &scope_id) == 0) {
+                                kfree(p);
+                                return 0;
+                        }
+                }
+
+                kfree(p);
+
+                sin6->sin6_scope_id = scope_id;
+                return 1;
+        }
+
+        return 0;
+}
+
+static size_t rpc_pton6(const char *buf, const size_t buflen,
+                        struct sockaddr *sap, const size_t salen)
+{
+        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+        u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
+        const char *delim;
+
+        if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
+            salen < sizeof(struct sockaddr_in6))
+                return 0;
+
+        memset(sap, 0, sizeof(struct sockaddr_in6));
+
+        if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
+                return 0;
+
+        if (!rpc_parse_scope_id(buf, buflen, delim, sin6))
+                return 0;
+
+        sin6->sin6_family = AF_INET6;
+        return sizeof(struct sockaddr_in6);
+}
+#else
+static size_t rpc_pton6(const char *buf, const size_t buflen,
+                        struct sockaddr *sap, const size_t salen)
+{
+        return 0;
+}
+#endif
+
+/**
+ * rpc_pton - Construct a sockaddr in @sap
+ * @buf: C string containing presentation format IP address
+ * @buflen: length of presentation address in bytes
+ * @sap: buffer into which to plant socket address
+ * @salen: size of buffer in bytes
+ *
+ * Returns the size of the socket address if successful; otherwise
+ * zero is returned.
+ *
+ * Plants a socket address in @sap and returns the size of the
+ * socket address, if successful.  Returns zero if an error
+ * occurred.
+ */
+size_t rpc_pton(const char *buf, const size_t buflen,
+                struct sockaddr *sap, const size_t salen)
+{
+        unsigned int i;
+
+        for (i = 0; i < buflen; i++)
+                if (buf[i] == ':')
+                        return rpc_pton6(buf, buflen, sap, salen);
+        return rpc_pton4(buf, buflen, sap, salen);
+}
+EXPORT_SYMBOL_GPL(rpc_pton);
+
+/**
+ * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
+ * @sap: socket address
+ *
+ * Returns a %NUL-terminated string in dynamically allocated memory;
+ * otherwise NULL is returned if an error occurred.  Caller must
+ * free the returned string.
+ */
+char *rpc_sockaddr2uaddr(const struct sockaddr *sap)
+{
+        char portbuf[RPCBIND_MAXUADDRPLEN];
+        char addrbuf[RPCBIND_MAXUADDRLEN];
+        unsigned short port;
+
+        switch (sap->sa_family) {
+        case AF_INET:
+                if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
+                        return NULL;
+                port = ntohs(((struct sockaddr_in *)sap)->sin_port);
+                break;
+        case AF_INET6:
+                if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
+                        return NULL;
+                port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
+                break;
+        default:
+                return NULL;
+        }
+
+        if (snprintf(portbuf, sizeof(portbuf),
+                     ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
+                return NULL;
+
+        if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
+                return NULL;
+
+        return kstrdup(addrbuf, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(rpc_sockaddr2uaddr);
+
+/**
+ * rpc_uaddr2sockaddr - convert a universal address to a socket address.
+ * @uaddr: C string containing universal address to convert
+ * @uaddr_len: length of universal address string
+ * @sap: buffer into which to plant socket address
+ * @salen: size of buffer
+ *
+ * Returns the size of the socket address if successful; otherwise
+ * zero is returned.
+ */
+size_t rpc_uaddr2sockaddr(const char *uaddr, const size_t uaddr_len,
+                          struct sockaddr *sap, const size_t salen)
+{
+        char *c, buf[RPCBIND_MAXUADDRLEN];
+        unsigned long portlo, porthi;
+        unsigned short port;
+
+        if (uaddr_len > sizeof(buf))
+                return 0;
+
+        memcpy(buf, uaddr, uaddr_len);
+
+        buf[uaddr_len] = '\n';
+        buf[uaddr_len + 1] = '\0';
+
+        c = strrchr(buf, '.');
+        if (unlikely(c == NULL))
+                return 0;
+        if (unlikely(strict_strtoul(c + 1, 10, &portlo) != 0))
+                return 0;
+        if (unlikely(portlo > 255))
+                return 0;
+
+        c[0] = '\n';
+        c[1] = '\0';
+
+        c = strrchr(buf, '.');
+        if (unlikely(c == NULL))
+                return 0;
+        if (unlikely(strict_strtoul(c + 1, 10, &porthi) != 0))
+                return 0;
+        if (unlikely(porthi > 255))
+                return 0;
+
+        port = (unsigned short)((porthi << 8) | portlo);
+
+        c[0] = '\0';
+
+        if (rpc_pton(buf, strlen(buf), sap, salen) == 0)
+                return 0;
+
+        switch (sap->sa_family) {
+        case AF_INET:
+                ((struct sockaddr_in *)sap)->sin_port = htons(port);
+                return sizeof(struct sockaddr_in);
+        case AF_INET6:
+                ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
+                return sizeof(struct sockaddr_in6);
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);